Hello aspirant,
I hope you are safe and healthy.
Yes, you can go for MA psychology even after BA Sociology. The most ideal way in an undergraduate degree BA and master's degree in the same subject area psychology in your case but many students do study different subject area from their undergraduate and master's degree.
You can visit the following link for further assistance:
https://university.careers360.com/articles/du-pg-eligibility-criteria
I hope it helps!
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